Intl support

[michael-markl]

As the current polyfill for ECMA-402 Intl under https://github.com/andyearnshaw/Intl.js/ is no longer maintained (see andyearnshaw/Intl.js#341) I would like you to reconsider adding support for this spec.

Is size the only problem for supporting this wiithin core-js?

Thanks a lot for all your efforts.

[likern]

This would be very valuable for React Native.
We need Intl support, which is not supported by Hermes Engine which is required on Android by popular react-native-reanimated V2 library.

See facebook/hermes#23 (comment) for more context.

[longlho]

@zloirock can you update the README to point to https://formatjs.io/docs/polyfills?

[zloirock]

I'll think about it. However, I'm not sure.

[zloirock]

@longlho done.